Derivative Financial Instruments - Offsetting Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Offsetting Assets and liabilities [Line Items]
Asset Fair Value	$ 331	$ 128
Liability Fair Value	395	99
Counterparty netting, Assets	(297)	(88)
Counterparty netting, Liabilities	(297)	(88)
Cash collateral netting, Assets	(30)	(37)
Cash collateral netting, Liabilities	(98)	(2)
Securities collateral netting, Assets	(1)	0
Securities collateral netting, Liabilities	0	(9)
Net receivables	3	3
Net payables	0	0
Equity contract
Offsetting Assets and liabilities [Line Items]
Notional Amount	60	98
Asset Fair Value	2	1
Liability Fair Value	2	1
Foreign exchange contracts
Offsetting Assets and liabilities [Line Items]
Notional Amount	705	632
Asset Fair Value	32	10
Liability Fair Value	3	20
Interest rate contracts
Offsetting Assets and liabilities [Line Items]
Notional Amount	17,033	17,478
Asset Fair Value	297	117
Liability Fair Value	388	76
Credit contracts
Offsetting Assets and liabilities [Line Items]
Notional Amount	159	201
Asset Fair Value	0	0
Liability Fair Value	$ 2	$ 2

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[Line Items] for Offsetting Assets and Liabilities [Table]

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